單項選擇題The ()pump is usually used as the lubricating oil pump.

A.turbine
B.screw
C.vaneejector
D.centrifugal


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1.單項選擇題The reciprocating pump can’t draw water from a tank may be caused by ().

A.leaky pipe
B.opened inlet valve
C.too much water in tank
D.None of the above

3.單項選擇題Hydraulic pumps most commonly used in steering systems are of the ().

A.lobe type
B.screw type
C.axial piston type
D.volute type

4.單項選擇題When an auxiliary boiler is panting and emitting black smoke, you should ().

A.increase the fuel oil temperature
B.decrease the fuel oil temperature
C.decrease the fuel oil supply pressure
D.increase the air supply

5.單項選擇題Close the ().

A.keyway
B.shaft
C.packing
D.valve

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